data seto japanSeto in Northern Aichi prefecture is synonymous with ceramics in Japan. This city is home to several ceramic artists and companies. Mapcarta, the open map.Seto (, Seto-shi) is a city in Aichi Prefecture, Japan. As of 1 October 2019 , the city had an estimated population of 127,659 in 56,573 households, and a population density of 1,146 persons per km . The total area was 111.40 square kilometres (43.01 sq mi).